convert import styles to themepark

Introduces presets which avoid much of the previous configuration
duplication. The original import files are now thin wrappers around
the themepark themes.

lib-lua/themes/nominatim/topics/address.lua

@@ -0,0 +1,23 @@
+local _, flex, cfg = ...
+
+flex.set_main_tags('admin')
+flex.modify_main_tags('street/' .. (cfg.street_theme or 'default'))
+flex.modify_main_tags{boundary = {postal_code = 'always'}}
+
+flex.set_name_tags('core')
+flex.modify_name_tags('address')
+
+flex.set_address_tags('core')
+flex.modify_address_tags('houses')
+
+flex.ignore_keys('metatags')
+flex.add_for_extratags('required')
+
+if cfg.with_extratags then
+    flex.set_unused_handling{delete_keys = {'tiger:*'}}
+    flex.add_for_extratags('name')
+    flex.add_for_extratags('address')
+else
+    flex.ignore_keys('name')
+    flex.ignore_keys('address')
+end